SNC1D – Static Electricity
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ELECTROSTATICS
Electrostatics is the study of static electric
charges. A static charge means a not moving
charge. Only one place on the object has a
charge. The three ways to make a static
charge are:
a) charging by friction
b) charging by contact
c) charging by induction
A) CHARGING BY FRICTION
When 2 substances are rubbed together, one
substance always loses electrons and the
other substance gains electrons. Remember
only electrons can move. To figure out which
substance will lose electrons use a triboelectric
series table. Sometimes this is called an
electrostatic series. (p 275 Nelson text)
SNC1D – Static Electricity
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TRIBOELECTRIC SERIES TABLE
Look at p 275 in your text. In this triboelectric
series table the substance at the top always
loses electrons to the substance at the bottom
when they are rubbed together. If cotton is
rubbed on plastic the cotton loses electrons
and has a positive charge. The plastic gains
electrons and has a negative charge.
SNC1D – Static Electricity
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ELECTROSTATIC DIAGRAMS
Electrostatic diagrams are drawn to show how 2 objects
are charged by friction. Here is the diagram showing a
neutral plastic ruler rubbed with a neutral piece of
cotton. Write down how many electrons and protons for
each object. Note: use 8 protons and 8 electrons for
neutral objects. All diagrams need WORDS, PICTURE and
COUNT.
SNC1D – Static Electricity
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A) Before Friction
Neutral polyethylene
Neutral plastic
FRICTION
Negative plastic
Neutral cotton
Move half the electrons
Positive Cotton
B) After Friction
- the objects have unlike charges and are attracted to
each other
- note only electrons moved. Draw the protons in the
same locations
SNC1D – Static Electricity
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Electrostatics
Electrostatics is the study of ___________________________________. A static charge means a
_______________________________________________. Only one place on the object has a
charge.
The three ways to make a static charge are:
1.
_________________________________
2.
_________________________________
3.
_________________________________
Charging by Friction
When 2 substances are rubbed together, one substance ____________ electrons and the
other substance _______________ electrons. Remember only ____________________ can
move. To figure out which substance will lose electrons use a
_____________________________________table. Sometimes this is called an _________________
series. (p 275 Nelson text )
TRIBOELECTRIC SERIES TABLE
Look at p 275 in your text. In this table the substance at the _______ always loses electrons to the
substance at the ________________ when they are rubbed together. If cotton is rubbed on
plastic the cotton loses electrons and has a _______________charge. The plastic gains electrons
and has a __________________ charge.
SNC1D – Static Electricity
Page: ___
ELECTROSTATIC DIAGRAMS
Electrostatic diagrams are drawn to show how 2 objects are charged by friction. Here is the
diagram showing a neutral plastic ruler rubbed with a neutral piece of cotton. Write down
how many electrons and protons for each object. Note: use 8 protons and 8 electrons for
neutral objects. All diagrams need WORDS, PICTURE and COUNT.
A) Before Friction
Neutral polyethylene
Neutral plastic
Neutral cotton
FRICTION
Negative plastic
Move half the electrons
Positive Cotton
B) After Friction
- the objects have unlike charges and are attracted to each other
- note only electrons moved. Draw the protons in the same locations.